/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Sets a metadata key/value on the specified variable
static void SetBlueprintVariableMetaData ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, const [FName](API\Runtime\Core\UObject\FName) & VarName, const [UStruct](API\Runtime\CoreUObject\UObject\UStruct) * InLocalVarScope, const [FName](API\Runtime\Core\UObject\FName) & MetaDataKey, const [FString](API\Runtime\Core\Containers\FString) & MetaDataValue )